Not sure about you guys, but my sound is such that it is loudest when the car is stressed the least. Like when it is coasting over really small bumps at very low speed. It also does it when shifting suddenly, or suddenly letti g out the clutch when coasting. That points toward mounts maybe. It does it while accelerating and also while braking and turning or not turning.if it were the bushings then it would mainly do it when the car is stressed....right?
My sound is for sure the sound of something that is loose. As it gets warmed up that sound becomes tighter until it goes away completey. It's its 45 degrees outside it does not go away completely.
After many times poking around under the only things that make the sound that I have found so far are: (and these are not the problem as determined by insulating them)
1) the hood prop rod
2) the manual shift lever at a the top of the tranny. The one with he counterweight. When you jiggle up and down its the EXACT same sound. Hard to insulate it though so maybe I did not do a good job of insulating it. My mic did not pick it up though even when I put the mic right next to the lever.
3) the battery cover. Removing all the battery cover pieces did nothing
4)the hood it self. I put rubber all around the hood and it was quiet as can be when tapping all around the hood.nitbhad no effect on the noise. I really thought that was it though for about a half hour:)
5) the front license plate...nope
The only thing I've found that makes he sound and I have NOT ruled out is the play in the driveshafts/cv joints. Jiggling those side to side makes the exact same sound. How would those respond to heat? My thinking is that they wound heat up slow, cuz they get heat from the ends of the shafts. From both ends (brakes and tranny). That would explain how long it takes for the sound to go away when heating up. It also explains the fact that when it is making the sound I seem to be able to feel play in the wheels, or get the vibe that the wheels are loose.
This week I drove my old 2001 jetta that we still have in the family, and it has almost 300 THOUSAND miles, on all the original suspension pieces, and that thing is tight as a drum and silent in the front. I'm gonna jiggle the driveshafts on it. If they jiggle back and forth, then that theory get dumped:)
I'm pretty relaxed about the noise now, in my mind I have concluded that its a minor thing, but one that shold be fixed. I have spent many hours on it. No money so far though:)
I found a set of chassis ears for 120 bucks......tempting